AUSTIN -- Texas has joined 20 other states in a lawsuit against the state of Delaware that seeks the return of $150 million in unclaimed funds recovered from the MoneyGram check service, officials announced Thursday.

Led by Arkansas Attorney General Leslie Rutledge, the states said they plan to file a lawsuit Thursday at the U.S. Supreme Court alleging that Delaware collected and deposited the money in its coffers as a part of a court settlement, when it should have been divided among the states.

Such legal disputes between states are litigated at the high court. The expected suit alleges violations of the Federal Dispositions Act, officials said.

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Texas Attorney General Ken Paxton, who traveled to Washington for the announcement, said Delaware kept the money "for its financial gain ...We are committed to get this money for unclaimed MoneyGram checks reverted to the states, claiming what rightfully belongs to our taxpayers.¨

In the lawsuit, Arkansas and the other states allege Delaware and MoneyGram have violated the federal law by giving all uncashed MoneyGram checks to Delaware instead of the state in which the money orders, traveler's checks or MoneyGram checks were purchased.

The suit alleges that an audit determined that Delaware owes more than $150 million to the other states. Texas could be owed more than $10 million; if all 49 states were to claim what is rightfully theirs, the total amount could reach $400 million, according to Paxton.

In addition to Arkansas and Texas, the states lined up to sue Delaware include Alabama, Arizona, Colorado, Florida, Idaho, Indiana, Kansas, Kentucky, Louisiana, Michigan, Montana, Nebraska, Nevada, North Dakota, Ohio, Oklahoma, South Carolina, Utah and West Virginia.